Pegmatites form from waters that separate from a magma in the late stages of crystallization; this activity often occurs in small pockets along the margins of a batholith. Pegmatite can also form in fractures that develop on the margins of the batholith. This is how pegmatite dikes are formed.

Is pegmatite formed from lava?

Some varieties of gems (including tourmalines, garnets, and beryls) form when pockets of water-rich magma cools and forms crystal masses called "pegmatites." Still others, particularly varieties of quartz gemstones, form during or after magma or lava cools and fractures in the cooling rock become locations where hot ...

Where does pegmatite found?

Pegmatite is found in all over the world. They are most abundant old rocks. Some are found in large intrusive igneous rocks, while others are scattered over rocks surrounding intrusive magmatic rocks. Worldwide, notable pegmatite occurrences are within the major cratons, and within greenschist-facies metamorphic belts.